Radio-resource management system and method thereof, and management apparatus, base station and terminal to be employed for it

ABSTRACT

Terminals and base stations belonging to service areas  100  to  102  of plural radio operators periodically measure a radio-link quality and an availability ratio of a radio link to notify them to a radio-resource management server  40 . The server  40  alters a frequency of the base station, and a transmitted-power quantity of the base station and the terminal based on these measured results to improve the radio-link quality, and reduces interference with a neighboring radio system. When a load is concentrated on a network of a specific radio operator, an instruction of handover is given to the terminal from the server  40  to realize a load distribution within the radio operator, and between the radio operators. When the server  40  detects excessive radio interference between the radio operators, it notifies occurrence of a fault, an interference quantity, a quantity of the transmitted power that the base station should attenuate, and the frequency that the base station should alter to the above radio operator that becomes an interference source.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a divisional of application Ser. No.10/735,826, filed Dec. 16, 2003, the entire contents of which areincorporated herein by reference.

BACKGROUND OF THE INVENTION

The present invention relates to a radio-resource management system anda method thereof, a management apparatus, a base station and a terminalto be employed for it, and a program thereof, and more particularly to atechnique of managing a radio resource extending over networks of aplurality of radio operators in a wireless network such as public mobilecommunication by a cellular technique, and a wireless LAN.

In a conventional wireless network, each radio operator installed radiobase stations independently, and the radio resource such as a frequencychannel that the radio base station and a radio terminal utilize,transmitted power of a radio link, and a transfer rate was managedindependently operator by operator. In the event of the public mobilecommunication by the cellular technique, an exclusive right to the useof a frequency band is normally given to each operator as license,whereby no radio interference occurs between the operators, and themanagement of the radio resource is in a good state because it isindependently managed enterprise by enterprise. In the event of assumingsuch an exclusive form of the radio resource by the license, theradio-resource management to be made by the radio operator becomes easyin the degree to which the interference from the other radio operatordoes not need to be considered.

In this case, however, even though a traffic demand is remarkably lessthan forecasted in a network of a specific radio operator, and thereexists the radio resource excessively, it is impossible to accommodatethe other radio operator with its excess, whereby the problem existsthat availability efficiency of the frequency goes down.

On the other hand, in the event of a wireless LAN system employing afrequency band such as 2.4 GHz and 5 GHz that does not necessitate thelicense, not only networks of a plurality of the radio operators andprivate networks, but also the system other than the wireless LANutilizing the same frequency band hold the radio resource in common. Inthe event of the wireless LAN, conventionally, each radio system wasisolated in many cases, and there were few cases whereintra-radio-system physical interference occurred between the operatorsbecause the maximum transmitted power was restricted at a relatively lowlevel. Also, in operating the wireless LAN within an enterprise, also inthe event that the wireless LAN areas overlap, to autonomously controlthe terminal or the radio base station alone sufficed for aradio-resource management method because it was relatively easy torealize unification of a management policy.

For example, as a method of the terminal's selecting the radio basestation autonomously in the wireless LAN, there is a method in which,responding to a radio-link quality that the terminal measured, a load ofthe wireless LAN, and so forth, the terminal selects the radio basestation for connection, of which the condition is best suitable for it(see patent documents 1 and 2).

Also, as an autonomous radio-resource management technique by the radiobase station in the wireless LAN, there is a method of dynamicallyswitching over an operational frequency channel of the wireless LANresponding to noise and interference (see patent document 3).Furthermore, as a technique of cooperatively managing the radio resourceby the terminal and the radio base station, there is a method in whichthe radio base station stores statistic information of the link qualityfor respective radio terminals, and comes up with the other radio basestations that become a candidate for a migration destination in theorder of priority (see patent document 4).

[Patent Document 1]

JP-P2001-298467A (pages 6 and 7, FIG. 6)

[Patent Document 2]

JP-P2001-274816A (pages 7 and 8, FIG. 4)

[Patent Document 3]

JP-P2002-009664A (page 2, FIG. 1 and FIG. 2)

[Patent Document 4]

JP-P2001-103531A (pages 2 to 5, FIG. 1 to FIG. 4)

These kinds of the autonomous radio-resource management by the terminalor the radio base station are relatively easy of realization, whereasthe problem exists that they do not always function as originallyplanned because there is restriction to information that can be mutuallynotified between the wireless networks of the plural operators havingdifferent operational policies, and also, because the effect can beexpected only when almost all terminals and radio base stationscorrespond to the autonomous radio-resource management.

In particular, the operator that provides an internet connection serviceby the wireless LAN in a public space such as an airport, an assemblyfall, and a restaurant has rapidly increased in recent years, and fromnow on, the situation is expected where the service areas of the pluraloperators overlap inside the identical public space. In this case, aplurality of the radio operators mutually hold the radio resource incommon, and as a result, the interference of the radio occurs betweenthe systems. In the conventional autonomous radio-resource managementtechnique, each radio operator is to alter the frequency channel of theradio base station, the transmitted power, the position of the radiobase station, etc. so as to avoid the interference based on limitedinformation that it can utilize; however optimal radio-resourceallocation is not always made in the entire system having the pluraloperators brought together because information is limited. Also, in theevent that a load was concentrated on a specific operator, such a schemeof distributing it among the operators did not exist. Also, in such amanner, a scheme of managing the radio resource of the plural operatorsin an integrated manner did not exist, whereby the service respondinghereto was also not considered.

SUMMARY OF THE INVENTION

The objective of the present invention is to provide a radio-resourcemanagement system and a method thereof, a server, a base station and aterminal to be employed for it, and a program thereof that enable theradio resource, which is held in common, to be optimally operated, bymanaging a wireless network quality of a plurality of the radiooperators in an integrated manner to alter the frequency channel of theradio base station, the transmitted power, the terminal to beaccommodated, and so forth responding to a necessity.

The radio-resource management method in accordance with the presentinvention is characterized in including a control step of, based onradio-link quality information to be notified from at least one of aplurality of radio base stations and radio terminals belonging torespective different operators, taking alteration control of a frequencythat said radio base station utilizes.

Another radio-resource management method in accordance with the presentinvention is characterized in including a control step of, based onradio-link quality information to be notified from at least one of aplurality of radio base stations and radio terminals belonging torespective different operators, taking transmitted-power control forsaid radio base station.

Yet another radio-resource management method in accordance with thepresent invention is characterized in including a control step of, basedon radio-link quality information to be notified from at least one of aplurality of radio base stations and radio terminals belonging torespective different operators, taking distribution control of a loadthat is a radio terminal to be accommodated in said radio base station.

An additional radio-resource management method in accordance with thepresent invention is characterized in including a control step of, basedon radio-link quality information to be notified from at least one of aplurality of radio base stations and radio terminals belonging torespective different operators, detecting an interference state betweenthe enterprises to take fault-notification control according to thisdetected result.

The radio-resource management apparatus in accordance with the presentinvention is characterized in including control means for, based onradio-link quality information to be notified from at least one of aplurality of radio base stations and radio terminals belonging torespective different operators, taking alteration control of a frequencythat said radio base station utilizes.

Another radio-resource management apparatus in accordance with thepresent invention is characterized in including control means for, basedon radio-link quality information to be notified from at least one of aplurality of radio base stations and radio terminals belonging torespective different operators, taking transmitted-power control forsaid radio base station.

Yet another radio-resource management apparatus in accordance with thepresent invention is characterized in including control means for, basedon radio-link quality information to be notified from at least one of aplurality of radio base stations and radio terminals belonging torespective different operators, taking distribution control of a loadthat is a radio terminal to be accommodated in said radio base station.

An additional radio-resource management apparatus in accordance with thepresent invention is characterized in including control means for, basedon radio-link quality information to be notified from at least one of aplurality of radio base stations and radio terminals belonging torespective different operators, detecting an interference state betweenthe enterprises to take fault-notification control according to thisdetected result.

The radio base station in accordance with the present invention, whichis a radio base station in a wireless network system including aradio-resource management apparatus for managing a radio resource, andradio base stations belonging to a plurality of respective differentradio operators, is characterized in including the means for: measuringa quality of a radio link to notify radio-link quality information thatis this measured result to said radio-resource management apparatus; andin reply to alteration-control notification of a frequency based on saidmeasured result from said radio-resource management apparatus, takingalteration control of a service frequency.

Another radio base station in accordance with the present invention,which is a radio base station in a wireless network system including aradio-resource management apparatus for managing a radio resource, andradio base stations belonging to a plurality of respective differentradio operators, is characterized in including the means for: measuringa quality of a radio link to notify radio-link quality information thatis this measured result to said radio-resource management apparatus; andin reply to transmitted-power control based on said measured result fromsaid radio-resource management apparatus, taking alteration control oftransmitted power.

The radio terminal in accordance with the present invention, which is aradio terminal in a wireless network system including a radio-resourcemanagement apparatus for managing a radio resource, and radio basestations belonging to a plurality of respective different radiooperators, is characterized in including the means for: measuring aquality of a radio link to notify radio-link quality information that isthis measured result to said radio-resource management apparatus; and inreply to alteration-control notification of a frequency based on saidmeasured result from said radio-resource management apparatus, takingalteration control of a service frequency.

Another radio terminal in accordance with the present invention, whichis a radio terminal in a wireless network system including aradio-resource management apparatus for managing a radio resource, andradio base stations belonging to a plurality of respective differentradio operators, is characterized in including the means for: measuringa quality of a radio link to notify radio-link quality information thatis this measured result to said radio-resource management apparatus; andin reply to transmitted-power control based on said measured result fromsaid radio-resource management apparatus, taking alteration control oftransmitted power.

Yet another radio terminal in accordance with the present invention,which is a radio terminal in a wireless network system including aradio-resource management apparatus for managing a radio resource, andradio base stations belonging to a plurality of respective differentradio operators, is characterized in including: means for measuring aquality of a radio link to notify radio-link quality information that isthis measured result to said radio-resource management apparatus; andbase-station alteration control means for, in reply to distributioncontrol of a connected radio terminal based on said measured result fromsaid radio-resource management apparatus, taking alteration control of aconnected base station.

The program in accordance with the present invention, which is a programfor causing a computer to execute a control operation of aradio-resource management apparatus in a wireless network system, ischaracterized in including a frequency control step of, based onradio-link quality information to be notified from at least one of radiobase stations and radio terminals belonging to respective differentoperators, taking alteration control of a frequency that said radio basestation utilizes.

Another program in accordance with the present invention, which is aprogram for causing a computer to execute a control operation of aradio-resource management apparatus in a wireless network system, ischaracterized in including a transmitted-power control step of, based onradio-link quality information to be notified from at least one of radiobase stations and radio terminals belonging to respective differentoperators, taking transmitted-power control for said radio base station.

Yet another program in accordance with the present invention, which is aprogram for causing a computer to execute a control operation of aradio-resource management apparatus in a wireless network system, ischaracterized in including a load-distribution control step of, based onradio-link quality information to be notified from at least one of radiobase stations and radio terminals belonging to respective differentoperators, taking load-distribution control of a load that is a radioterminal to be connected to said radio base station.

An additional program in accordance with the present invention, which isa program for causing a computer to execute a control operation of aradio-resource management apparatus in a wireless network system, ischaracterized in including a step of, based on radio-link qualityinformation to be notified from at least one of radio base stations andradio terminals belonging to respective different operators, makingnotification of occurrence of a fault and the interference quantity, thetransmitted-power quantity that the radio base station should attenuate,and the frequency that the radio base station should alter to a networkmanagement server of the radio operator that is an interference sourcein the event that radio interference having a pre-specified value ormore from the other radio operator was detected within a network of acertain radio operator.

A further additional program in accordance with the present invention,which is a program for causing a computer to execute a control operationof a radio base station in a wireless network system including aradio-resource management apparatus for managing a radio resource, andradio base stations belonging to a plurality of respective differentradio operators, is characterized in including the steps of: measuring aquality of a radio link to notify radio-link quality information that isthis measured result to said radio-resource management apparatus; and inreply to alteration-control notification of a frequency based on saidmeasured result from said radio-resource management apparatus, takingalteration control of a service frequency.

Another program in accordance with the present invention, which is aprogram for causing a computer to execute a control operation of a radiobase station in a wireless network system including a radio-resourcemanagement apparatus for managing a radio resource, and radio basestations belonging to a plurality of respective different radiooperators, is characterized in including the steps of: measuring aquality of a radio link to notify radio-link quality information that isthis measured result to said radio-resource management apparatus; and inreply to transmitted-power control based on said measured result fromsaid radio-resource management apparatus, taking alteration control oftransmitted power.

Another program in accordance with the present invention, which is aprogram for causing a computer to execute a control operation of a radioterminal in a wireless network system including a radio-resourcemanagement apparatus for managing a radio resource, and radio basestations belonging to a plurality of respective different radiooperators, is characterized in including the steps of: measuring aquality of a radio link to notify radio-link quality information that isthis measured result to said radio-resource management apparatus; and inreply to alteration-control notification of a frequency based on saidmeasured result from said radio-resource management apparatus, takingalteration control of a service frequency.

Another program in accordance with the present invention, which is aprogram for causing a computer to execute a control operation of a radioterminal in a wireless network system including a radio-resourcemanagement apparatus for managing a radio resource, and radio basestations belonging to a plurality of respective different radiooperators, is characterized in including the steps of: measuring aquality of a radio link to notify radio-link quality information that isthis measured result to said radio-resource management apparatus; and inreply to transmitted-power control based on said measured result fromsaid radio-resource management apparatus, taking alteration control oftransmitted power.

Another program in accordance with the present invention, which is aprogram for causing a computer to execute a control operation of a radioterminal in a wireless network system including a radio-resourcemanagement apparatus for managing a radio resource, and radio basestations belonging to a plurality of respective different radiooperators, is characterized in including the steps of: measuring aquality of a radio link to notify radio-link quality information that isthis measured result to said radio-resource management apparatus; and inreply to distribution control of a connected radio terminal based onsaid measured result from said radio-resource management apparatus,taking alteration control of a connected base station.

The radio-resource management system in accordance with the presentinvention is characterized in including: means for collecting a linkquality, a link availability ratio, and a link communication speed of aradio link from at least one of radio base stations and radio terminalsbelonging to a plurality of respective different operators; and pricedecision means for deciding a price at which a communication service viaa network of each of said plurality of said operators is offered to anexternal network responding to these collected results to notify it tosaid external network.

Another radio-resource management system in accordance with the presentinvention, which is a radio-resource management system including aradio-resource management server that a radio-resource managerpossesses, and radio facilities of a radio communication operator thatmade a management contract with this radio-resource manager, ischaracterized in that said radio-resource management server includes:fault process means for supervising a communication status of said radiocommunication operator to perform a fault process for said radioresource in reply to occurrence of a fault; and fee charging means forcharging a management service fee of said radio resource to said radiocommunication operator.

BRIEF DESCRIPTION OF THE DRAWINGS

This and other objects, features and advantages of the present inventionwill become more apparent upon a reading of the following detaileddescription and drawings, in which:

FIG. 1 is a configuration diagram of the radio-resource managementsystem in the first embodiment of the present invention;

FIG. 2 is a schematic functional block diagram of the radio base stationin the first embodiment of the present invention;

FIG. 3 is an operational flowchart of the radio base station in thefirst embodiment of the present invention;

FIG. 4 is a view illustrating contents of the radio-link measuredinformation to be transmitted from the radio base station to theradio-resource management server in the first embodiment of the presentinvention;

FIG. 5 is a schematic functional block diagram of the radio terminal inthe first embodiment of the present invention;

FIG. 6 is an operational flowchart of the radio terminal in the firstembodiment of the present invention;

FIG. 7 is a view illustrating contents of the radio-link measuredinformation to be transmitted from the radio terminal to theradio-resource management server in the first embodiment of the presentinvention;

FIG. 8 is a schematic functional block diagram of the radio-resourcemanagement server in the first embodiment of the present invention;

FIG. 9 is an operational flowchart of the radio-resource managementserver in the first embodiment of the present invention;

FIG. 10 is an operational flowchart at the moment that theradio-resource management server performs the frequency alterationcontrol for the radio base station in the first embodiment of thepresent invention;

FIG. 11 is an operational flowchart (part 1) at the moment that theradio-resource management server performs the transmitted-power controlfor the radio base station in the first embodiment of the presentinvention;

FIG. 12 is an operational flowchart (part 2) at the moment that theradio-resource management server performs the transmitted-power controlfor the radio base station in the first embodiment of the presentinvention;

FIG. 13 is a view illustrating each relation of the radio base-stationlists (NB_list), (NB_list1), and (NB_list2) in FIG. 10 and FIG. 11;

FIG. 14 is an operational flowchart at the moment that theradio-resource management server controls the radio terminal in order tomake the load distribution between the radio base stations in the firstembodiment of the present invention;

FIG. 15 is an operational flowchart at the moment that theradio-resource management server notifies the occurrence of the fault inthe radio link to the network management server in the first embodimentof the present invention;

FIG. 16 is an operational flowchart of the radio terminal in the secondembodiment of the present invention;

FIG. 17 is an operational flowchart of the radio terminal in the thirdembodiment of the present invention;

FIG. 18 is a view illustrating contents of the radio-link measuredinformation to be transmitted from the radio base station to theradio-resource management server in the fourth embodiment of the presentinvention;

FIG. 19 is an operational flowchart of the intra-radio-base-station loaddistribution in the fourth embodiment of the present invention;

FIG. 20 is a configuration diagram of the radio-resource managementsystem in the fifth embodiment of the present invention;

FIG. 21 is a schematic block diagram of the radio-resource managementserver 40 in the fifth embodiment of the present invention;

FIG. 22 is an operational flowchart of the radio-resource managementserver in the sixth embodiment of the present invention;

FIG. 23 is an operational flowchart of the radio-resource managementserver in the seventh embodiment of the present invention;

FIG. 24 is a view illustrating an example of the tenant building forrealizing the business model of the eighth embodiment of the presentinvention;

FIG. 25 is a view illustrating an operational sequence of theradio-resource management system for realizing the business model in theeighth embodiment of the present invention;

FIG. 26 is a functional block diagram of the radio-resource managementserver for realizing the business model in the eighth embodiment of thepresent invention.

DESCRIPTION OF THE EMBODIMENTS

Hereinafter, embodiments of the present invention will be explained indetails by referring to the accompanied drawings. In FIG. 1 is shown aconfiguration of the radio-resource management system in a firstembodiment of the present invention. A service area 100 of a radiooperator A, a service area 101 of a radio operator B, and a service area102 of a radio operator C exist in a partially-overlapped state, and aradio-resource management server 40 manages the radio resource in aunified manner that these three operators hold in common. Herein, assumethat each of the operators mutually makes a contract for roaming withthe other so that respective radio terminals can freely roam among theseservice areas 100 to 102 for continuing communication, and this roamingallows each of the service areas to interpolate the other. Also, eachoperator may employ the configuration having a network management serverfor an operator within the network (In FIG. 1, a network managementserver 60 of the radio operator A is shown as one example).

Radio terminals 10 and 11, which are connected to a radio base station20, make data communication via radio links 201 and 202 in the servicearea 100 of the radio operator A. Radio base stations 20 and 21 areconnected to a cable network 30 of the radio operator A via cable links300 and 301 respectively, and further connected to a radio-resourcemanagement server 40 and an external network 50 via cable links 310 and320 respectively.

Radio terminals 12 to 14, which are connected to a radio base station22, make data communication via radio links 203 to 205 in the servicearea 101 of the radio operator B. The radio terminal 12 is connectableto both of the radio base station 22 of the radio operator B and theradio base station 21 of the radio operator A; however, herein it isconnected to the radio base station 22 of the radio operator B. Theradio base station 22 is connected to a cable network 31 of the radiooperator B via a cable link 302, and further connected to theradio-resource management server 40 and the external network 50 viacable links 311 and 312 respectively.

A radio terminal 15 that is connected to a radio base station 23, andradio terminals 16 and 17 that are connected to a radio base station 24make data communication via radio links 206 to 208 respectively in theservice area 102 of the radio operator C. The radio terminals 15 and 16are connectable to both of the radio base station 22 of the radiooperator B and the radio base stations 23 and 24 of the radio operatorC; however, herein they are connected to the radio base stations 23 and24 of the radio operator C respectively. The radio base stations 23 and24 are connected to a cable network 32 of the radio operator C via cablelinks 303 and 304 respectively, and further connected to theradio-resource management server 40 and the external network 50 viacable links 312 and 322 respectively.

FIG. 2 is a schematic functional block diagram of the radio basestation, wherein down-direction user data (packet data), for which atransmission process is performed by a transmission section 69, istransmitted to the radio terminal via a transmit-receive shared unit 61and an antenna. A radio wave received from the antenna is supplied to areception section 62 through the transmit-receive shared unit 61, andup-direction user data and various kinds of control informationincluding a pilot signal, etc. are derived. The quality and theavailability ratio of the radio link are measured by a link-qualitymeasurement section 64 and a link availability-ratio measurement section65 respectively based on these kinds of the user data and the controlinformation. Also, a neighboring radio base station that becomes anobject of notification to the radio-resource management server isdecided to measure information relating to the above decided neighboringradio base station in an interference-quantity measurement section 66.As one example of how to decide this, there is a method of deciding itbased on the level of the radio wave received from the neighboring radiobase station to be later described.

The various kinds of the measured information transmitted from the radioterminal are detected in a radio terminal measured-result detectionsection 67, and this detected result and the results measured by thelink-quality measurement section 64, the link availability-ratiomeasurement section 65, and the interference-quantity measurementsection 66 are synthesized in a data synthesis section 68, and notifiedas radio-link measured information 600 to the radio-resource managementserver via a communication section 73. Also, various messages to beobtained from the radio-resource management server via the communicationsection 73 are analyzed in a message analysis section 74, and thisanalyzed result is supplied to a control section 71 that is a CPU. Thecontrol section 71 controls a reception control section 63 and atransmission control section 70 according to this analyzed result, andperforms the process such as frequency-alteration control andtransmitted-power control to be later described. In addition, a memory72 can be a memory for work of the CPU, and can be a memory having anoperational control program filed.

In FIG. 3 is illustrated an operational flowchart of the radio basestation in a first embodiment of the present invention. At first, theradio base station performs an initialize process after a boot, acquiresinformation such as the frequency channel, the transmitted power, anaddress of its own station, and an address of the radio-resourcemanagement server, and performs various configurations (step 401).

Next, the radio base station starts a timer T1 (step 402), and comesinto a wait state of an event (step 403). This timer T1 is fordesignating a period at which the measured result of the radio link isnotified from the radio base station to the radio-resource managementserver, and its period is a variable value that can be set radio basestation by radio base station. After the radio base station acquiredradio-link quality information of its own station (step 404), radio-linkavailability-ratio information (step 405), and interference informationfrom the neighboring radio base station that became an object ofnotification to the radio-resource management server (step 406) whenevera time-out of T1 occurs, it transmits the measured result to theradio-resource management server (step 407), and then returns to a waitstate of an event after restarting the timer T1.

Next, in the event that the radio base station received a radio-resourcecontrol message from the radio-resource management server (step 409), itperforms a frequency-channel alteration process (step 411) if thecontrol content is a frequency-channel alteration request (step 410),and alters the transmitted power to a designated value (step 413) if itis a transmitted-power alteration request (step 412). Normally, atransfer process of data is independent from these control messages, anda packet transfer process is performed between the cable link and theradio link, and between the radio link and the cable link (steps 414 to416). Furthermore, at the time of shutting the radio base station down,the process is finished after the finish process was performed (steps417 and 418).

In FIG. 4 is an illustrated content of radio-link measured information600 to be transmitted from the radio base station to the radio-resourcemanagement server in the first embodiment of the present invention. Theradio-link measured information 600 is configured of radio-link qualityinformation of its own station 610, radio-link availability-ratioinformation of its own station 620, a number of a neighboring radio basestation 630, and information 640, 650, 660, . . . of radio interferencewith neighboring radio base stations 1, 2, 3, . . . . These kinds of theradio-link quality information, the radio-link availability-ratioinformation, and the radio interference information can be referred toas radio-link quality information in a mass. That is, this radio-linkavailability ratio also can be referred to as quality informationbecause there rises congestion, and communication quality deteriorateswhen the radio-link availability ratio becomes large, and also, needlessto say, the interference information falls into a category of thequality information.

In the radio-link quality information of its own station 610 areincluded a radio operator identifier 611, a radio base-stationidentifier 612, a frequency channel 613, installment-location latitudeinformation 614, installment-location longitude information 615, areceived-packet error ratio 616, and a transmitted-power level 617. Forexample, in the event of the wireless LAN, Service Set ID (SSID) isemployed for the radio operator identifier 611, and an MAC (Media AccessControl) address of the radio base station for the radio base-stationidentifier 612 respectively. The frequency channel 613 is represented bya channel number allocated for each radio system, or the frequencyitself thereof is represented in a unit of kHz.

The attitude/longitude information of the installment location is usedonly in the event that the radio base station has these kinds ofinformation. A Global Positioning System (GPS), a PHS technique, etc.are considered as means for acquiring this attitude/longitudeinformation. Also, it is possible that a person who installs the basestation measures it manually. The received-packet error ratio 616indicates a rate at which a CRC (Cyclic Redundancy Check) error occurredas against the packets received from the radio terminals under the basestation during the measurement period, and as to the transmitted-powerlevel, a power level at which the radio base station is transmitting thepower toward the radio terminal is represented in a unit of dBm.

In the radio-link availability-ratio information of its own station 620are included a physical speed of a radio link 621, an accommodated radioterminal number 622, an average transmission rate 623, an averagereception rate 624, a peak transmission rate 625, and a peak receptionrate 626. The accommodated radio terminal number 622 indicates thenumber of the radio terminals connected under the above radio basestation. The average transmission rate 623 and the average receptionrate 624 are average bit rates obtained by dividing the bit numbertransmitted/received during the measurement period via the radio link bythe measurement period, respectively. On the other hand, the peaktransmission rate 625 and the peak reception rate 626 indicate themaximum bit numbers transmitted/received for any one second during themeasurement period respectively.

A number of a neighboring radio base station 630 indicates the number ofthe radio base stations to be included in the radio-link measuredinformation 600, out of the other radio base stations that can bedetected in the above radio base stations. That is, the other basestations, from which the level of the radio wave received in the aboveradio base station is equal to or more than a predetermined threshold,are taken as “other radio base stations that can be detected in theabove radio base station”, and “the number to be included in theradio-link measured information 600” out of the number of these otherbase stations is a number of the radio base stations from which thereceived level is equal to or more than a second threshold obtained bysetting the threshold of the level received in the above radio basestation to be yet higher. By transmitting only information relating tothe other radio base stations having the possibility of interfering withits own station to the radio-resource management server, the aim ofreducing the traffic quantity to prevent the congestion of the networkis realized.

The radio base station may not always notify all the detectedinformation of the other radio base stations to the radio-resourcemanagement server. In the information 640 of radio interference with theneighboring radio base station 1 are included a radio operatoridentifier 641, a radio base-station identifier 642, a frequency channel643, a received-power level 644, and a ratio of a received signal: noise645. What this means is the same as the description concerning theradio-link quality information of its own station 610. As a matter offact, the interference quantity from the other radio base stations isfound from the total of the received-power levels from the otherstations in the frequency channel identical to that of its own station.

Next, the radio terminal will be explained. FIG. 5 is a schematicfunctional block diagram of the radio terminal, wherein a down-directionsignal received from the antenna is supplied to a reception section 76via a transmit-receive shared unit 75, and user data and various controlsignals are derived. These user data and various control signals areinput into a link-quality measurement section 78, a linkavailability-ratio measurement section 79, an interference-quantitymeasurement section 80, and a message analysis section 81 respectively.The quality of the radio link is measured in the link-qualitymeasurement section 78, the availability ratio of the radio link in thelink availability-ratio measurement section 79, and the interferencequantity in the interference-quantity measurement section 80,respectively. Also, various messages from the radio-resource managementserver are analyzed in the message analysis section 81. As the case maybe, the above messages are transmitted via the radio base station.

A control section 83 that is a CPU takes various kinds of control for areception control section 77 and a transmission control section 86, i.e.frequency-alteration control, transmitted-power control, base-stationalteration control, etc. in according to the analyzed result of thismessage. The foregoing various kinds of measured information aresynthesized with up-direction user data by a transmitted-data synthesissection 82, and is supplied to a transmission section 85. Thesynthesized information for which the transmission process is performedby this transmission section 85 is transmitted in the up direction viathe transmit-receive shared unit 75. In addition, a memory 84 also canbe a memory for work of the CPU 83, and can be a memory having a controlprogram of the above radio terminal filed.

FIG. 6 is a flowchart illustrating an operation of the radio terminal inthe first embodiment of the present invention. The radio terminalperforms an initialize process after a boot, sets the frequency channeland the transmitted power for connecting to the neighboring radio basestation, and acquires an address of its own station and an address ofthe radio-resource management server, etc. for performing variousconfigurations (step 421). Next, the radio terminal starts a timer T2(step 422), and comes into a wait state of an event (step 423). A valueof this timer T2 decides the period at which the measured result of theradio link is notified from the radio terminal to the radio-resourcemanagement server.

After the radio terminal acquired the quality information of the radiolink to the radio base station during communication (step 424), theavailability-ratio information of the radio link to the radio basestation during communication (step 425), and the quality information(interference information) of the link to the neighboring radio basestation (step 426) whenever a time-out of T2 occurs, it transmits themeasured result to the radio-resource management server (step 427), andthen returns to a wait state of an event after restarting the timer T2(step 428).

Next, in the event that the radio terminal received the radio-resourcecontrol message from the radio-resource management server (step 429), italters the transmitted power to a designated value (step 431) if thecontrol contents is a transmitted-power alteration request (step 430),and it makes handover to the designated radio base station (step 435) ifthe control contents is a radio base-station alteration request (step432). At this time, in the event that the radio-resource control messagerequires a roaming that extends over the radio operators (step 433), itperforms a radio operators alteration process such as authenticationresponding to a necessity (step 434). In the event that normal data wasinput into the radio terminal, the transmission/reception process isperformed for the packet (steps 436 to 438), and in the event that theshutdown process was initiated, the process is finished after the finishprocess was performed (steps 439 and 440).

FIG. 7 is a view illustrating contents of radio-link measuredinformation 700 to be transmitted from the radio terminal to theradio-resource management server in the first embodiment of the presentinvention. The radio-link measured information 700 is configured ofquality information of a radio link to a radio base station duringcommunication 710, availability-ratio information of a radio link to aradio base station during communication 720, a number of a neighboringbase station 730, and quality information 740, 750, 760, . . . of radiointerference with neighboring radio base stations 1, 2, 3, . . . .

The quality information of a radio link to a radio base station duringcommunication 710 is configured of a radio operator identifier 711, aradio base-station identifier 712, a frequency channel 713, areceived-power level 714, a ratio of a received-signal: noise 715, areceived-packet error ratio 716, and a transmitted-power level 717. Inthe availability-ratio information of a radio link to a radio basestation during communication 720 are included an average transmissionrate 721, an average reception rate 722, a peak transmission rate 723,and a peak reception rate 724.

Also, in the quality information 740 of radio interference with theneighboring radio base station 1 are included a radio operatoridentifier 741, a radio base-station identifier 742, a frequency channel743, a received-power level 744, and a ratio of a received-signal: noise745. The meaning that this notification information has is the same asthe explanation of FIG. 4.

The radio-link measured information 700 shown in FIG. 7 to betransmitted from the radio terminal to the radio-resource managementserver and the radio-link measured information 600 shown in FIG. 4 to betransmitted from the radio base station to the radio-resource managementserver have the partially duplicated part such as the numbers of theneighboring radio base station 630 and 730, and the frequency channels613 and 713.

Also, upon taking the total sum of the availability-ratio information ofa radio link to a radio base station during communication 720 collectedfrom each radio terminal radio base station by radio base station, itsvalue is due to be equal to the radio-link availability-ratioinformation of its own station 620 that the radio base station measured.Furthermore, information of radio interference with a neighboring radiobase station 640 to 660 that the radio base station measured also can beestimated to a certain extent from information of interference with aneighboring radio base station 740 to 760 that the radio terminalmeasured. For example, by assuming that the radio terminals areuniformly distributed in the adjacent area of the radio base station toaverage the levels received from the neighboring radio base stationsthat a plurality of the radio terminals measured, it is possible toestimate the interference quantity from the neighboring radio basestation that the radio base station to which the radio terminal belongsreceives.

The reason why the radio-link measured information to be collected iscaused to have redundancy as mentioned above is to realize the operationin a system wherein are mixed the conventional radio base station andradio terminal that have neither radio-link measurement function, norfunction of notification to the radio-resource management server asdescribed in this embodiment.

For example, in the event that a radio terminal group having thenotification function of the radio-link measured information shown inFIG. 7 exists under the conventional radio base station having nonotification function of the radio-link measured information shown inFIG. 4, the radio-resource management server can estimate the radio-linkquality and the availability ratio by radio base station, and the degreeof the interference with the other radio base station from theradio-link measured information 700 collected by the above radioterminal group. Also, conversely, in the event that the conventionalradio terminal having no notification function of the radio-linkmeasured information shown in FIG. 7 exists under the radio base stationhaving the notification function of the radio-link measured informationshown in FIG. 4, the frequency alteration process, the transmitted-powercontrol process, and the load-distribution control process can beexecuted in the radio-resource management server, based on theradio-link measured information collected mainly from the radio basestation.

In addition, a communication protocol is optional for transmitting theradio-link measured information 600 and 700 from the radio base stationor the radio terminal to the radio-resource management server. Forexample, as a protocol suitable for transmitting such network managementinformation, there is an SNMP (Simple Network Management Protocol, RFC2570-2576). Also, the transmission of the measured information 700 fromthe radio terminal to the radio-resource management server may beperformed via the radio base station or may be performed without goingthrough it. In the event of transmitting the measured information 700via the radio base station, by getting the measured information 700together in the radio base station from the radio terminals that aresubordinates thereof to transmit it to the radio-resource managementserver, efficiency can be realized.

FIG. 8 is a schematic functional block diagram of the radio-resourcemanagement server. A control section 87 is a CPU that takes control ofeach section according to a program filed in a ROM 90 of a memory 88.The memory 88 has a RAM 89 that is a memory for work for the CPU 87, andthe foregoing ROM 90. A frequency-alteration control section 91 has afunction of taking alteration control of the frequency channel for radiobase station, and a transmitted-power control section 92 has a functionof taking control of the transmitted power for radio base station. Also,an intra-base-station load-distribution control section 93 has afunction of taking distribution control of the intra-base-station load,and a radio-link fault-occurrence notification control section 94controls notification of the fault occurrence to the radio base station.A communication section 95 has a function of making communication withthe radio base station and the radio terminal. Each section thereof isconnected to a bus 96 in common.

In FIG. 9 is illustrated an operational flowchart of the radio-resourcemanagement server in the first embodiment of the present invention.After the radio-resource management server performed an initializeprocess (step 451), and after it started four timers of T3, T4, T5, andT6 (step 452), it comes into a wait state of an event (step 453). T3designates the period at which the alteration control process (step 454)is performed of the frequency channel of the radio base station. T4designates the period at which the transmitted-power control process(step 456) is performed for the radio base station. T5 designates theperiod of control (step 458) for the radio terminal. Also, T6 designatesthe period at which the fault-notification process (step 460) isperformed at the moment that excessive interference was detected fromthe radio base station.

These processes are performed independently with a time-out of thetimers T3 to T6. In addition hereto, in the event that the measuredinformation was received from the radio base station or the radioterminal (step 462), a process for retaining the measured result isperformed, and in the event that the shutdown was initiated, a finishprocess (step 464) is performed.

In FIG. 10 is illustrated an operational flowchart at the moment thatthe radio-resource management server performs the frequency-alterationcontrol of the radio base station in the first embodiment of the presentinvention. The radio-resource management server reads out information ofthe radio base station retained at the moment that the radio-linkmeasured information was received in the order filed from a head radiobase station by radio base station (step 471). Next, the radio-resourcemanagement server lists the neighboring radio base stations utilizing afrequency channel (F_cur) identical to that of its own station 613 fromthe read-out information, and acquires a radio base-station list(NB_list) that is composed of these neighboring radio base stations(step 472).

Next, a total (I_cur) is calculated of the received-power levels 644 ofthe radio base-station group belonging to this radio base-station list(NB_list) (step 473). In addition, the total of this received-powerlevels is equivalent to the interference quantity. Next, the total ofthe received-power levels for each of all frequency channels that itsown station can utilize is found from the read-out information to assumeit to be an interference quantity of its channel. And a total (I_tar) ofreceived-power levels from the neighboring radio base stations isacquired in a frequency channel (F_min) of which the interferencequantity is few (step 474).

Herein, in the event that a difference of the interference quantityI_cur-I_tar is larger than a predetermined threshold I_fth (step 475),after the radio-resource management server transmitted theradio-resource control message to the selected radio base station, andinstructed it to make the frequency-channel alteration from F_cur toF_min (step 476), it deletes information on the radio base station ofwhich the frequency channel was altered from the memory (step 477). Whenthe radio base-station information that had to be read out ran out, theprocess is finished (step 478).

As a modified example of the process of the foregoing steps 474 to 476,the following technique also can be considered. That is, in the eventthat the total of the received-power levels found in the step 473 islarger than the total of received levels of the other radio basestations in the frequency other than the frequency that is currentlyutilized, out of the frequencies that the selected radio base stationcan utilize, the means is adapted so as to make an alteration to thefrequency other than this frequency that is currently utilized.

Here, the interference not only from the system of the identical radiooperator but also from that of the different radio operator is includedin the interference quantity (the total of the received-power levels)from the neighboring radio base stations. In performing this frequencyalteration process, it is desirable that the value of the timer T3 isset to be significantly long, or that the timer T3 is adapted to bestarted to the time when the system is hardly utilized because the radioterminals under the radio base station become all incapacitatedtemporarily. Also, in the above-mentioned explanation, computation ofI_cur and I_tar was performed in a radio base-station frequency controlprocess 454 of FIG. 9; however the above computation may be performed ina measured-result retention process 463 at the moment of retaining themeasured result.

In FIG. 11 and FIG. 12 is illustrated an operational flowchart at themoment that the radio-resource management server performs thetransmitted-power control of the radio base station in the firstembodiment of the present invention. Also in this case, theradio-resource management server sequentially reads out the radiobase-station information from a head radio base station by radio basestation (step 481). Next, the radio-resource management server acquiresa radio base-station list (NB_list) having the neighboring radiobase-station group utilizing a frequency channel (F_cur) identical tothe frequency channel that the selected radio base station (its ownstation) utilizes listed (step 483), acquires a list (NB_list1)indicating the radio base-station group belonging to the radio operatoridentical to the radio operator to which the selected radio base stationbelongs, out of the radio base stations to be included in this radiobase-station list (NB_list) (step 484), and also, acquires a list(NB_list2) indicating the radio base-station group that belongs to theradio operator different from the radio operator to which the selectedradio base station belongs, and yet is controllable by theradio-resource management server (step 485).

The reason why the radio base station is limited to the radiobase-station group that is controllable by the radio-resource managementserver is that it is necessary to use only the result measured by theradio base station that is controllable by the above server because themeasured result of the radio link was transmitted to the above serverfrom all radio base stations including the radio base station that isuncontrollable by the above server, and these measured results were allretained within the above server.

In addition, a relation of these radio base-station lists (NB_list),(NB_list1), and (NB_list2) mentioned above is illustrated in FIG. 13.

Herein, the radio-resource management server switches on atransmitted-power reduction flag FL_down for the base station, of whichthe received level exceeded a threshold IC_pc1, and of which the currenttransmitted power is equal to or more than the lower limit value out ofthe radio base stations to be included in this radio base-station list(NB_list1) for taking control as as to reduce the interference quantity(step 486). Also, it similarly switches on the transmitted-powerreduction flag FL_down for the base station, of which the received levelexceeded a threshold Ic_pc2, and of which the current transmitted poweris equal to or more than the lower limit value, out of the radio basestations to be included in the list (NB_list2) (step 487).

The reason why the threshold of the interference quantity is sorted outbetween the identical radio operator and the radio operator other thanit is that it is necessary to suppress quantity of the interference withthe other radio operator at a lower level than that within the identicalradio operator. In such a manner, after the radio base stations of whichthe level received in the other radio base station exceeded thethreshold were all listed, the process proceeds to an actualtransmitted-power control process (FIG. 12). The retained radiobase-station information is sequentially read out from a head basestation by base station (step 488), and if the transmitted-powerreduction flag FL_down of the selected radio base station is on (step489), the radio-resource control message is transmitted to the selectedradio base station to instruct it to reduce the transmitted power byDelta_P1 (step 490).

On the other hand, in the event that FL_down was off in the step 489, ifthe transmitted power of the selected radio base station is equal to orless than the upper limit value (step 491), the radio-resource controlmessage is transmitted to the selected radio base station to instruct itto increase the transmitted power by Delta_P2 (step 492). In such amanner, raising the transmitted power as highly as possible so long asno interference occurs allows a covered range of the network of theradio operator to be spread.

In FIG. 14 is illustrated a flowchart of an operation in which theradio-resource management server gives the radio terminal an instructionof the handover, and makes load distribution between the radio basestations in the first embodiment of the present invention. At first, theradio-resource management server sequentially reads out the retainedradio base-station information from a head base station by base station(step 501), and acquires a number N_m of the radio terminals that aselected radio base station BS1 accommodates (step 502). Thisaccommodated radio terminal number N_m is the accommodated radioterminal number 622 in the radio-link measured information 600 shown inFIG. 4.

In the event that the number N_m of the radio terminals that were beingaccommodated exceeded an allowable threshold (N_th) that is the maximumnumber of the radio terminals that can be accommodated in a radio basestation BS1, i.e. N_m>N_th (step 503), the radio-resource managementserver selects the radio base stations, which belong to the operator,identical to the operator to which the selected radio base stationbelongs, in the order of the less number of the accommodated terminalsout of the neighboring radio base stations while it makes a reference tothe retained information (step 504). Herein, in the event that a radiobase station BS2, which is a radio base station of the identicaloperator, and of which the accommodated terminal number is few, existsin the neighborhood, it is investigated whether one radio terminal ormore that currently belongs to BS1 and is connectable to the selectedneighboring radio base station BS2 exists (step 505). By making areference to radio interference information 740, 750, and 760 to betransmitted from the radio terminal, and so forth, this investigationcan be made. And, if such a radio terminal exists, this radio terminalis instructed to switch over the connection-destination radio basestation from BS1 to BS2 (step 506).

On the other hand, also in the event that no radio base station of theidentical operator exists in the neighborhood, and that only the radiobase station, which belongs to the different operator and of which theaccommodated terminal number is few, exists in the neighborhood, theprocess is similarly performed (step 507). In such a manner, the loaddistribution can be made from the network side in the event that theload (the connected radio terminal number) is greatly biased between theidentical operator and the different operator.

In FIG. 15 is illustrated an operational flowchart at the moment thatthe radio-resource management server notifies the occurrence of thefault in the radio link to a network management server in the firstembodiment of the present invention. At first, the radio-resourcemanagement server sequentially reads out the retained radio base-stationinformation from a head radio base station by radio base station (step521), and acquires a list (NB_list) of the neighboring radio basestations utilizing a frequency channel (F_cur) identical to thefrequency channel that the selected radio base station (its own station)utilizes (step 522).

Next, the radio-resource management server acquires a list (NB_list1) ofthe radio base stations belonging to the radio operator identical to theradio operator to which the selected radio base station belongs, out ofthe radio base stations to be included in this list (NB_list) (step523), and acquires a list (NB_list2) of the radio base-stations thatbelong to the radio operator different from the radio operator to whichthe selected radio base station belongs, and are controllable by theradio-resource management server, out of the radio base stations to beincluded in this list (NB_list) (step 524). The meaning of theseNB_list1 and NB_list2 is similar to the explanation of FIG. 13.

Next, the radio-resource management server switches on afault-notification flag FL_notify for the base station, of which thereceived level exceeded a threshold Ic_fl1, and of which afault-notification-done flag FL_notify_done is off, out of the radiobase stations to be included in the list (NB_list1) (step 525). Also, itsets the fault-notification flag FL_notify to be on for the basestation, of which the received level exceeded a threshold Ic_fl2, and ofwhich a fault-notification-done flag FL_notify_done is off, out of theradio base stations to be included in the list (NB_list2) (step 526).

Also herein, the reason why the threshold of the interference quantity(received level) is sorted out between the identical radio operator andthe radio operator other than it is that it is necessary to suppress thequantity of the interference with the other radio operator at a lowerlevel than that within the identical radio operator. After theradio-resource management server marked the base stations for which thefault notification had to be made in a general way, it sequentiallyreads out the radio base station information (step 527), transmits aradio-resource management message to the network management server ofthe radio operator to which the radio base station for which thefault-notification flag FL_notify was set to be on (step 528) belongs,and notifies to it.

the occurrence of the fault

the interference quantity

the quantity of the transmitted power that the radio base station shouldattenuate

the value of the frequency channel that that radio base station shouldalter

or the area in which the radio base station should be re-arranged (step529).

Furthermore, the fault-notification-done flag FL_notify_done is set tobe off for the radio base station for which the notification was made(step 530) so that the fault notification is not made repeatedly. Thisfault-notification-done flag may be manually set to be off when thefault was cancelled, or may be automatically set to be off by confirmingthat the fault was cancelled, and stability was kept.

In FIG. 16 is illustrated an operational flowchart of the radio terminalin a second embodiment of the present invention. In the secondembodiment of the present invention, the value of the timer is switchedover in two stages responding to the link quality at the moment that theradio terminal notifies the link quality to the radio-resourcemanagement server. In an initial state, the value of the timer T2 is setat T_fast of which the period is short in advance (step 441), and thevalue of the timer T2 is switched over to T_slow of which the period islong at the moment that an average level value Pa received from theradio base station during communication exceeded a fast-measuredthreshold Pa_th, and was stabilized in a good quality state (step 443).

On the other hand, in the event that the average received-level value Pabecame equal to or less than the fast-measured threshold Pa_th, theperiod of the timer T2 is shorten once again for restarting it (step444). In addition, the similar control may be applied for the radio basestation. In such a manner, prolonging the notification period during thetime that the quality is in good state allows the quantity of thenotification traffic for control to be reduced, and the congestion ofthe network to be alleviated.

In FIG. 17 is illustrated an operational flowchart of the radio terminalin a third embodiment of the present invention. Also in this case,similarly, the value of the timer at the moment that the radio terminalnotifies the link quality to the radio-resource management server isswitched over in two stages; however a criterion for switching over isdecided by a distribution value of the received level. In the event thata received-level distribution value Pd from the radio base-stationduring communication falls below a fast-measured threshold Pd_th (step445), fluctuation in the quality is regarded to be mild, and themeasurement period T2 is set to be long (step 443). In the event thatthe distribution value Pd exceeded Pd_th, the measurement period T2 isset to be short once again (step 444). In addition, the similar controlmay be applied for the radio base station.

In such a manner, setting the notification period to be long during thetime that the quality is in good state allows the quantity of thenotification traffic for control to be reduced, and the congestion ofthe network to be alleviated.

In FIG. 18 is illustrated contents of radio-link measured information601 to be transmitted from the radio base station to the radio-resourcemanagement server in a fourth embodiment of the present invention. Adifference between it and the radio-link measured information 600 in thefirst embodiment is to include cable-link availability-ratio informationof its own station 670. The cable-link availability-ratio information ofits own station 670 is configured of a cable-link physical speed 671, anaverage transmission rate 672, an average reception rate 673, a peaktransmission rate 674, and a peak reception rate 675.

The average transmission rate 672 and the average reception rate 673 areaverage bit rates obtained by dividing the bit numbers that the radiobase station transmitted/received via the cable link connected heretoduring the measurement period by the measurement period respectively.The peak transmission rate 674 and the peak reception rate 675 representthe maximum bit numbers transmitted/received via the cable link for anyone second during the measurement period respectively.

In FIG. 19 is illustrated an operational flowchart of theintra-radio-base-station load distribution in the fourth embodiment ofthe present invention. In the fourth embodiment, the radio-resourcemanagement server gives an instruction of the handover to the radioterminal, thereby allowing the load distribution to be realized. Adifference between it and the load distribution in the first embodiment(FIG. 14) is steps 510 and 511. That is, as shown in these steps 510 and511, consideration was taken into an availability ratio of the cablelink (ρ1=the average rate/the physical speed of the cable link) as acriterion for starting the load distribution in addition to the numberof the radio terminals that the radio base station accommodates. In sucha manner, making the load distribution responding to the congestionstatus of the upstream cable links 300 to 304 as well in addition to theload of the radio link enables the more efficient distribution of theload as a whole of the network.

In FIG. 20 is illustrated a configuration view of the radio-resourcemanagement system in a fifth embodiment of the present invention. Inthis fifth embodiment, the radio operators A, B, and C installradio-resource management servers 41, 42, and 43 respectively. In thiscase, after once the radio-link measured information that the radioterminal or the radio base station transmitted were aggregated in theradio-resource management servers 41, 42, and 43 of the radio operatorsrespectively, they are transferred to the radio-resource managementserver 40 in a mass.

In such a manner, transferring the radio-link measured information in alump to the radio-resource management server that is a third-party organafter it was brought together within each operator allows the quantityof the control traffic to be reduced.

A schematic functional block diagram of the radio-resource managementserver 40 of this third-party organ is illustrated in FIG. 21, and theidentical parts to FIG. 8 are indicated with the identical numerals. Acommunication service price decision section 97 was added to the blockof FIG. 8 in FIG. 21, and the other configuration is identical to thatof FIG. 8. This communication service price decision section 97 has afunction of, responding to the quality etc. of each of the radio linksof a plurality of the radio operators, taking decision control of aprice at which the communication service is offered to the externalnetwork, and the details of its operation are shown in FIG. 22 and FIG.23.

In FIG. 22 is illustrated an operational flowchart of the radio-resourcemanagement server, in particular, the communication service pricedecision section 97 in a sixth embodiment of the present invention. Theidentical parts to FIG. 9 are indicated with the identical numerals inFIG. 22. In this sixth embodiment, the radio-resource management serverdecides the price at which the communication service via the network ofeach radio operator is offered to the external network, and notifiesthis price to the above external network (steps 802 to 805). At thistime, as an element for deciding this price, there are each quality(Qwi) of all radio links belonging to a radio operators i, each speed(Swi) of the radio links, and each availability ratio (ρwi) of the radiolinks, and the values obtained by adding these respective qualities(Qwi), speeds (Swi), and availability ratios (p wi) for summing up areemployed (step 803).

For example, each quality (Qwi) of the radio links can be calculatedfrom the received-packet error ratio (616 of FIG. 4), each speed (Swi)of the radio links from the radio-link physical speed (621 of FIG. 4),and each availability ratio (ρwi) of the radio links from the averagetransmission rate (623 of FIG. 4), the average reception rate (624 ofFIG. 4), and the radio-link physical speed (621 of FIG. 4),respectively.

And, a predetermined price decision function f (Qwi, Swi, ρwi) isemployed to calculate a current price Vi for the external network of theradio operator i. The calculated current price Vi is notified to theexternal network from the radio-resource management server (step 805),and in addition hereto, is notified to each radio operator and eachradio terminal as well. In such a manner, altering the price of thecircuit responding to the speed, the quality, and the availability ratioof the radio link group allows the optimal network of the radio operatorto be always offered to the external network.

For example, the function shown below can be employed as if (Qwi, Swi,ρwi).f(Qwi,Swi,ρwi)=αQwi+βSwi+γρwiwhere α+β+γ=1

Also, the above-mentioned price decision and notification process areexecuted by taking the time-out of the timer T7 as a trigger afterinitializing the radio-resource management server.

In FIG. 23 is illustrated an operational flowchart of the radio-resourcemanagement server, in particular, the communication service pricedecision section 97 in a seventh embodiment of the present invention.The identical parts to FIG. 22 are indicated with the identical numeralsin FIG. 23. In this seventh embodiment, in addition to the operation ofthe sixth embodiment shown in FIG. 22 is added an operation for causingthe external network to receive the guarantee that the current price ofthe circuit of the radio operator i does not exceed a predeterminedupper limit value Vi_max in compensation for a radio-resource managementfee that was paid to an entity operating the radio-resource managementserver from the external network.

That is, the third-party organ operating the radio-resource managementserver decides the operational fee for operating it so that the price atwhich the communication service via the network of each radio operatoris offered to the external network becomes equal to or less than theupper limit value predetermined between the third-party organ and theexternal network, and collects its charge from the operator of theexternal network. And, in the event that the price of the communicationservice does not reach the above upper limit value, the third-partyorgan is to offer the communication service to the external-networkoperator at a then price (current price).

For this, the process of restraining the current value Vi to Vi_max isperformed in the radio-resource management server (step 807) in theevent that the computed current price Vi exceeded the above upper limitvalue Vi_max (step 806). The other process is similar to that of thesixth embodiment of FIG. 22.

Needless to say, the operational flow of each apparatus mentioned aboveis realized by pre-filing it as a program in a record medium such as aROM to cause the CPU that is a computer to read it for execution.

A technique of a business model employing the foregoing radio-resourcemanagement system as an eighth embodiment of the present invention willbe explained below while a reference is made to the accompanieddrawings. As one example, a case is described where the radiocommunication operator operates the radio communication system such as aLAN in a three-storied tenant building as shown in FIG. 24. A tenant-1to a tenant-3 utilize the floors of this tenant building respectively,and an owner of the tenant building manages the radio resource of theradio communication system that the tenant-1 to the tenant-3 operate,thereby allowing the radio communication quality to be guaranteed and anadditive value of the building itself to be enhanced.

An operational sequence of the embodiment of the business model in thisexample is illustrated in FIG. 25. The owner of this building makes amanagement contract on the radio resource within the building with anowner of the radio-resource management server (step S1), and entrustshim/her with a radio-resource management business employing theradio-resource management server. And, the tenant (for example, thetenant-1) who desires to operate the radio communication service makes aradio-resource utilization contract with the owner of the building (stepS2).

In the event that the tenant utilizes radio facilities such as the radiobase station, he/she registers radio-facility information relating tothe radio facilities to the radio-resource management server via theowner of the building and the owner of the radio-resource managementserver (steps S3 and S4), and actually installs the radio facilities(for example, the radio base station) (step S5).

The radio-resource management server acquires the radio-link measuredinformation 600 (see FIG. 4) and 700 (see FIG. 7) from the registeredradio facilities and the radio terminals, and supervises thecommunication status of the radio communication operator. That is, itsupervises the occurrence of the fault such as the occurrence ofhigh-load status and the occurrence of the interference day after day(steps S6-1 to S6-4). And, when the radio-resource management serverdetects a high-load communication status (step S7), it presents, forexample, a fault-avoidance countermeasure such as extending the radiofacilities, and altering the installment-location of the radiofacilities, etc. via the owner of the radio-resource management serverand the owner of the building to the tenant having the radio facilitieswhere the high-load communication status is occurring (steps S8 to S10).

Herein, in the event that other tenant (for example, the tenant-2)utilizes the similar radio facilities, similarly to the explanation madein the event of the former tenant-1, he/she makes the radio-resourceutilization contract (step S11). And, the radio-facility informationrelating to the radio facilities of the tenant-2 is registered to theradio-resource management server (step S12), and the radio facilitiesare installed actually (steps S13 and S14).

The radio-resource management server acquires the radio-link measuredinformation 600 and 700 from the registered radio facilities of thetenant-2 and the radio terminals, and similarly supervises itscommunication status day after day (steps S15-1 and S15-2). At thistime, when the interference occurs between the base stations that arethe radio facilities of the tenant-1 and the tenant-2 (step S17), theradio-resource management server outputs an instruction of thealteration of the frequency, the alteration of the transmitted power,etc. to the radio facilities causing the interference to occur in orderto cancel the interference (step S18), and presents an interferenceavoidance countermeasure. When the fault is removed thereby (step S19),the radio-resource management server makes a report of its effect to itsowner (step S20).

In such a manner, in the event that the owner of the radio-resourcemanagement server supervised the daily radio communication statusemploying the radio-resource management server to detect the fault,he/she makes a rule of offering the service for carrying out theautomatic avoidance, the notification of the fault, and the presentationof a fault-cancellation idea. The matter stands in such a manner thatthe owner of the radio-resource management server charges the managementfee etc. including a fee for the above service to the owner of thebuilding who is a person enjoying this service (step S21), and that theowner of the building pays the radio-resource management service fee tothe owner of the radio-resource management server (step 25), and theowner of the building charges the radio-resource utilization fee to thetenant who made the radio resource contract (steps S23 and S24).

At this time, by establishing disparity in level (class) of the serviceto be offered to the tenant in advance, different service fees can beset responding to the level of the service. For example,

(1) A service only for automatic interference avoidance,

(2) A notification service of the high-load communication status inaddition to the above-mentioned (1),

(3) A presentation service of a fault-avoidance countermeasure inaddition to the above-mentioned (2), and so forth can be considered. Asto the interference, it is apparent, that a business model techniquealso can be considered of, by regarding the tenant-1 to the tenant-3 asthe radio operator, making the management contract directly with theowner of the radio-resource management server without going through theowner of the building. In this case, the owner of the radio-resourcemanagement server is to be entrusted with the radio resource managementof the radio communication operator to offer a service enabling an offerof the high-quality radio communication environment to contracted usersof the radio communication operator.

FIG. 26 is a view illustrating an outline of a functional block diagramof the radio-resource management server to be employed for the businessmodel technique shown in FIG. 25, and the identical parts to FIG. 8 areindicated with the identical numerals. In FIG. 26, a fault processsection 98 has a frequency-alteration control section 91, atransmitted-power control section 92, and a base-stationload-distribution control section 93, and each of these stations 91 to93, which has an identical function to each of the sections 91 to 93shown in FIG. 8 respectively, receives the radio-link measuredinformation 600 and 700 from the radio facilities to supervise thecommunication status of the radio link, and to detect the faultoccurrence (the interference and the high load), and performs anavoidance-countermeasure process of it.

In a database 100 are registered information relating to a personenjoying the service who made the radio-resource management contract,information relating to the radio facilities, information relating tothe service level (class), and information relating to its service fee,etc. A service fee charging section 99 charges the service fee to theowner of the building (in the event of bypassing the owner of thebuilding, directly to the tenant of the building) based on informationregistered in this database 100. The other configuration and thefunction are identical to that of FIG. 8, and its explanation isomitted.

As mentioned above, in accordance with the present invention, the effectexists that, by managing the wireless network quality of a plurality ofthe radio operators in a integrated manner to alter the frequencychannel of the radio base station, the transmitted power, the terminalto be accommodated, and so forth responding to a necessity, it becomespossible to optimally operate the radio resource that is held in common.

1. A radio-resource management method comprising a control step of,based on radio-link quality information to be notified from at least oneof a plurality of radio base stations and radio terminals belonging torespective different operators, taking transmitted-power control forsaid radio base station, wherein said radio-link quality informationincludes at least a received level of a radio link, and that saidcontrol step has a step of, out of the radio base stations that utilizea frequency identical to the frequency that said radio base stationcurrently utilizes and yet belong to an identical radio operator, takingtransmitted-power reduction control for the radio base station, of whichthe received level exceeded a first threshold, and of which currenttransmitted power is equal to or more than a lower limit value.
 2. Theradio-resource management method according to claim 1, wherein saidradio-link quality information is notified at a predeterminednotification period.
 3. The radio-resource management method accordingto claim 2, wherein, in the event that a link quality of the radio linkexceeded a predetermined threshold, said notification period is set tobe longer than it is set in the event that it is equal to or less thansaid threshold.
 4. The radio-resource management method according toclaim 2, wherein, in the event that a distribution value of the linkquality of the radio link measured within a constant period exceeded apredetermined threshold, said notification period is set to be longerthan it is set in the event that it is equal to or less than saidthreshold.
 5. A radio-resource management method comprising a controlstep of, based on radio-link quality information to be notified from atleast one of a plurality of radio base stations and radio terminalsbelonging to respective different operators, taking transmitted-powercontrol for said radio base station, wherein said control step has astep of, out of the radio base stations that utilize a frequencyidentical to the frequency that said radio base station currentlyutilizes and yet belong to a different radio operator, taking secondtransmitted-power reduction control for the radio base station, of whichthe received level exceeded a second threshold, and of which currenttransmitted power is equal to or more than a lower limit value.
 6. Theradio-resource management method according to claim 5, wherein saidradio-link quality information is notified at a predeterminednotification period.
 7. The radio-resource management method accordingto claim 6, wherein, in the event that a link quality of the radio linkexceeded a predetermined threshold, said notification period is set tobe longer than it is set in the event that it is equal to or less thansaid threshold.
 8. The radio-resource management method according toclaim 6, wherein, in the event that a distribution value of the linkquality of the radio link measured within a constant period exceeded apredetermined threshold, said notification period is set to be longerthan it is set in the event that it is equal to or less than saidthreshold.
 9. A radio-resource management apparatus comprisingcontroller for, based on radio-link quality information to be notifiedfrom at least one of a plurality of radio base stations and radioterminals belonging to respective different operators, takingtransmitted-power control for said radio base station, wherein saidradio-link quality information includes at least a received level of aradio link, and that said controller has means for, out of the radiobase stations that utilize a frequency identical to the frequency thatsaid radio base station currently utilizes, and yet belong to anidentical radio operator, taking transmitted-power reduction control forthe radio base station, of which the received level exceeded a firstthreshold, and of which current transmitted power is equal to or morethan a lower limit value.
 10. A radio-resource management apparatuscomprising controller for, based on radio-link quality information to benotified from at least one of a plurality of radio base stations andradio terminals belonging to respective different operators, takingtransmitted-power control for said radio base station, wherein saidcontroller has means for, out of the radio base stations that utilize afrequency identical to the frequency that said radio base stationcurrently utilizes, and yet belong to a different radio operator, takingsecond transmitted-power reduction control for the radio base station,of which the received level exceeded a second threshold, and of whichcurrent transmitted power is equal to or more than a lower limit value.